Crazy W124 electrical gremlins

Discussion in 'Electronics' started by ms500, Aug 4, 2008.

  1. ms500

    ms500 Banned

    Jun 18, 2008
    I noticed the strangest thing while driving the 300TE the other day:

    Every time I pressed the brake pedal; the fuel, temperature, and oil pressure gauges all dropped down to zero as if the ignition had been swiched off, and the seatbelt reminder light started flashing even though I was wearing my seatbelt at the time.

    As soon as I released my foot off the brake pedal, the gauges all came back to life instantly :crazy: Then when I pressed the pedal again, the same thing happened.

    This happened a few times then went away, and the problem only comes back occasionally. The rest of the car continues to operate normally.

    Could this be a faulty relay or something?
  2. grober

    grober MB Master

    Jun 22, 2003
    Perth, Scotland
    W204 C200CDI Estate
    Sounds as if you have an intermittant direct short to earth in the brake light circuit somewhere which is pulling the voltage to the instruments down- in effect switching them off. Time to have a look at your wiring. Maybe a water leak into one of your rear lamp clusters
    Last edited: Aug 4, 2008
  3. Number_Cruncher

    Number_Cruncher Active Member

    Jan 14, 2008
    1995 E300D
    Check the connections of fuse 5 - in fact give all of your fuses a spin in their holders.

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